Avanti - 1963 Studebaker Avanti

R3 Engines Technical Specifications

The production R3 was a high-performance version of the supercharged R2 engine; the R4 was a high-performance version of the unsupercharged R1 engine. Nine 1964 Avantis with R3 engines were built. Although the R4 engine was optional in 1964, none were produced before the Avanti was discontinued in December 1963. The Granatelli brothers took the first R3, which was an early prototype completed in April 1962, to the Nevada desert where a timed top speed of 171.10 was recorded. For a time, Studebaker could boast of having produced what President Sherwood Egbert proclaimed as "the world's fastest production car." In September 1963, the Granatellis took an R3 to Bonneville where the car did a two-way flying mile at an average of 170.75 mph. Vince Granatelli claims the engines tested on the dyno at 400 gross horsepower, but even a more realistic 300 horses would make this the fastest production Studebaker.

For the R3 Andy Granatelli expanded the standard Studebaker 289 V-8 to 304.5 cubic inches. A Paxton supercharger provided the increased pressure in the fuel-air mixture to achieve greater engine efficiency. R3 and R4 Avantis used a larger rearend housing with heavy duty flanged axles rather than the standard Avanti tapered axle. The rearends were Dana Spicer Model 44's. Specially cast heads with much larger valves were fitted and Iskenderian dual valve springs were optional. A hotter cam was added and heavy-duty bearings installed. Major moving parts were balanced and magna-fluxed. The top edges of the cylinder head bores were chamfered to match the cylinder head combustion chambers, and special flattop forged aluminum pistons filled the holes. Custom exhaust headers were used on all R3's as was a Prestolite transistor ignition system. Chassis and bodies built for R3-powered cars were also modified. Chassis had heavy-duty spring and strengthened control arm bushings. Bodies were shimmed to clear the carburetor pressure box fed by the supercharger.
R3 Engine
R3 Engine
Studebaker R3 Specifications
ITEM
DATA
Engine
Overhead valve V-8, 304.5-cu .in., 400 hp @ 6000 rpm
Base price
Base price: $ 5,980 (includes R3 performance package)
Base weight
195 lbs
Body
Reinforced fiberglass with steel roll bar
Frame
Ladder type with X-member and four
Wheelbase
109 inches
Length
192.4 inches
Track (f/r)
57.4/56.6
Suspension
Independent coil springs, tubular
Suspension (rear)
Semi-elliptic springs, tubular shocks and anti-sway bar
Brakes
Hydraulic disc
Brakes (rear)
Hydraulic finned drum, power-assisted
Compression Ratio
9.75:1
Transmission
3-speed Warner power-shift automatic
Studebaker Avanti R-Series Comparison Table
series
cu. in.
carb
super charger
comp ratio
distributor
cam
springs
heads
pistons
exhaust manifolds
ignition
tach
R1
289
single 4 brl
non-super charged
10.25:1
dual point
260 deg
single valve springs
R2
289
single 4 brl
super charged
9.0:1
dual point
260 deg
single valve springs
R3
304.5
single 4 brl
super charged
9.5:1
dual point/ mechanical advance
276 or 288 deg
single or dual valve springs
special
forged
tuned port
transigniter (transistor ignition)
8000 rpm scale
R4
304.5
dual 4 brl
non-super charged
12:1
dual point/ mechanical advance
276 or 288 deg
single or dual valve springs
special
forged
tuned port
transigniter (transistor ignition)
R5 (Paxton)
dual-super charged
Studebaker Avanti 1964 Production R3 Profile
Serial Number
Original Locations
Paint Color
Transmission
R5089
Downers Grove, Illinois
turquoise
4-speed
R5237
Seattle, Washington
black
4-speed
R5394
Kingston, Pennsylvania
white
4-speed
R5532
Vauxhall, New Jersey
turquoise
4-speed
R5546
Fort Wayne, Indiana
gold
4-speed
R5593
Yuma, Arizona
gray
automatic
R5625
Toledo, Ohio
black
automatic
R5642
Moline, Illinois
white
automatic
R5643*
Jackson, Mississippi
white
automatic
*Last Studebaker Avanti
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